diff --git a/test/rebuild_known_failures.sh b/test/rebuild_known_failures.sh
new file mode 100644
index 0000000..08869fe
--- /dev/null
+++ b/test/rebuild_known_failures.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+if [ -z $1 ]; then
+  echo Usage: $0 LANGUAGE
+  echo Re-list all failures of a specific LANGUAGE into known_failures_Linux.json
+  echo LANGUAGE should be library name like cpp, java, py etc
+  exit 1
+fi
+
+if [ -z $PYTHON]; then
+  PYTHON=python
+fi
+
+TARGET_LANG=$1
+OUT_FILE=known_failures_Linux.json
+echo Rebuilding known failures for $TARGET_LANG
+
+TMPFILE=.__tmp__rebuild__
+grep -v -e "\"$1-" -e "\-$1_" $OUT_FILE > $TMPFILE
+mv $TMPFILE $OUT_FILE
+$PYTHON test.py --client $1
+$PYTHON test.py -U merge
+$PYTHON test.py --server $1
+$PYTHON test.py -U merge